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  • MRI  (2)
  • Key wordsLycium chinense  (1)
  • numerical algorithm  (1)
  • 1
    ISSN: 1279-8517
    Keywords: Semimembranosus m. ; Lateral meniscus ; Anatomy ; MRI ; Oblique popliteal ligament
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Une étude morphologique et en IRM des terminaisons du tendon distal du m. semi-membraneux et des structures postérieures de la capsule du genou a été réalisée à partir de 42 genoux de cadavres. Un faisceau tendineux du m. semi-membraneux s'insérant sur la corne postérieure du ménisque latéral a été trouvée dans 43,2 % des genoux disséqués en plus des cinq faisceaux déjà connus : capsulaire, direct, antérieur et inférieur, ainsi que le lig. poplité oblique. Ce faisceau présentait trois types morphologiques : fin, large, rond. Quel que soit son type, sa traction vers l'arrière mobilisait le ménisque latéral. De ce fait, le m. semi-membraneux aurait également un rôle protecteur sur le ménisque latéral, identique à celui déjà décrit pour le ménisque médial lors de la flexion du genou. Lorsque le tendon du m. semi-membraneux présente un faisceau d'insertion sur la corne postérieure du ménisque latéral, il est difficile en IRM de différencier cette insertion d'une rupture du ménisque latéral et cela peut être une cause d'erreur diagnostique.
    Notes: Summary Forty-two cadaver knees were used for morphologic and MRI observations of the tendinous distal expansions of the semimembranosus m. and the posterior capsular structures of the knee. A tendinous branch of the semimembranosus m. inserting into the posterior horn of the lateral meniscus was found in 43.2% of the knees dissected, besides five already known insertional branches; capsular, direct, anterior and inferior, as well as the oblique popliteal ligament. The tendon had three morphologic types; thin, broad and round. All three types moved the lateral meniscus posteriorly when pulled on. Thus, the semimembranosus m. may also have a protective function for the lateral meniscus as well as the already well established function of protecting the medial meniscus in knee flexion. When a semimembranosus tendon attachment to the posterior horn of the lateral meniscus is present, its normal insertion is difficult to differentiate from a lateral meniscus tear in MRI and this may cause misdiagnosis.
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  • 2
    ISSN: 1279-8517
    Keywords: Semimembranosus m. ; Lateral meniscus ; Anatomy ; MRI ; Oblique popliteal ligament
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Forty-two cadaver knees were used for morphologic and MRI observations of the tendinous distal expansions of the semimembranosus m. and the posterior capsular structures of the knee. A tendinous branch of the semimembranosus m. inserting into the posterior horn of the lateral meniscus was found in 43.2% of the knees dissected, besides five already known insertional branches; capsular, direct, anterior and inferior, as well as the oblique popliteal ligament. The tendon had three morphologic types; thin, broad and round. All three types moved the lateral meniscus posteriorly when pulled on. Thus, the semimembranosus m. may also have a protective function for the lateral meniscus as well as the already well established function of protecting the medial meniscus in knee flexion. When a semimembranosus tendon attachment to the posterior horn of the lateral meniscus is present, its normal insertion is difficult to differentiate from a lateral meniscus tear in MRI and this may cause misdiagnosis.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical geology 19 (1987), S. 549-559 
    ISSN: 1573-8868
    Keywords: nonnegative kriging weights ; kriging equations ; nonlinear optimization ; numerical algorithm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Under a constant drift, the linear kriging estimator is considered as a weighted average ofn available sample values. Kriging weights are determined such that the estimator is unbiased and optimal. To meet these requirements, negative kriging weights are sometimes found. Use of negative weights can produce negative block grades, which makes no practical sense. In some applications, all kriging weights may be required to be nonnegative. In this paper, a derivation of a set of nonlinear equations with the nonnegative constraint is presented. A numerical algorithm also is developed for the solution of the new set of kriging equations.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-203X
    Keywords: Key wordsLycium chinense ; Hepatoprotective cerebroside ; HPLC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Suspension cultures derived from Lycium chinense Miller seedlings produced significant amounts of a hepatoprotective cerebroside. Callus was induced from the stem of aseptic seedlings of L. chinense and maintained on MS solid media supplemented with 1.0 ppm 2,4-D and 0.1 ppm kinetin. Suspension cultures were established, and the cells were grown in the same liquid media in the dark. Lyophilized cells were extracted with a combined reagent of chloroform and methanol (2:1, v/v). An aqueous suspension of the evaporated cell extract was partitioned with chloroform, and the chloroform layer was subjected to silicic acid column chromatography followed by semi-preparative reverse phase C8 high pressure liquid chromatography. The purified compound showed hepatoprotective activity comparable to that shown by silymarin, and the structure was identified as 1-O-(β-d-glucopyranosyl)-(2S,3R,4E,8Z)-2-N-2′-hydroxy-(palmitoyl)-4,8-sphingadiene on the basis of spectral data. The content of the compound in cultured cell was tenfold higher than that of the fruit of L. chinense. The biosynthesis of the compound in cultured cell systems appears to parallel cell growth.
    Type of Medium: Electronic Resource
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